Takruri H R, Humeid M A
Department of Nutrition and Food Technology, Faculty of Agriculture, University of Jordan, Amman.
Nutr Health. 1988;6(2):89-98. doi: 10.1177/026010608800600202.
Forty six selected species of wild edible herbs and vegetables common in Jordan were collected from their natural growing places; twelve of them were collected from more than one location. The nitrate contents of the edible parts, and in some cases non-edible parts, were determined using the cadmium reduction method. The nitrate level varied widely ranging from 29 mg/kg in the leaves of tetragonolbus (Tetragonolobus Palaestinus) to 6743 mg/kg in star fenugreek (Trigonella Stellata). With the exception of the families of Araceae and Cruciferae, there was a wide variation in the nitrate concentrations within the species of each family. In general, the nitrate content of the stems was higher than that of the leaves which in turn was higher than that of the roots and bulbs. The same species collected from irrigated (presumably fertilized) farms were generally of higher nitrate content than those collected from pasture, forest or non-irrigated farms. However, many of the studied plants remain of relatively high nitrate content regardless of where they were grown.
从约旦常见的野生可食用草本植物和蔬菜中挑选了46个物种，从它们的自然生长地采集；其中12种是从多个地点采集的。使用镉还原法测定了可食用部分以及某些情况下不可食用部分的硝酸盐含量。硝酸盐含量差异很大，从四角豆（Tetragonolobus Palaestinus）叶片中的29毫克/千克到胡卢巴（Trigonella Stellata）中的6743毫克/千克不等。除天南星科和十字花科外，每个科的物种内硝酸盐浓度存在很大差异。一般来说，茎中的硝酸盐含量高于叶中的，叶中的又高于根和鳞茎中的。从灌溉（可能施肥）农场采集的同一物种通常比从牧场、森林或非灌溉农场采集的硝酸盐含量更高。然而，许多被研究的植物无论生长在哪里，硝酸盐含量都相对较高。
